Geekbench is just an objective measure. I'm using a Late-2009 Macbook at work (8GB RAM/250GB SSD/Yosemite/external 1080p display). Of course it produces more heat and has less battery life, but it's still a nice machine. My daily usage consists on using Netbeans (and a Apache/MySql/PHP development environment), Safari, Firefox, Wine, Pixelmator, Mail, LibreOffice and Pages. Sometimes, I use Wireshark and build apps from Macports. I think the only real benefit I'd get from a new Mac in this scenario would be when building apps with Macports.
The faster I/O, processing power and memory would probably produce executable files sooner, but I believe we still didn't see a quantum leap. This will happen, perhaps, when we get real octa-cores, 4GB/s SSDs, GPUs that can handle retina resolutions easier and better software (the most important).
If you're not looking for quantum leaps, of course a brand new Macbook Pro will give you more comfort.